How to install windows 8 in pc

Solution
How to install Microsoft Windows 8 on the Windows 7-based computer:
Update the UEFI BIOS to the latest version which supports Windows 8.
Turn off the computer.
Turn on the computer.
While the “To interrupt normal startup, press Enter” message is displayed at the lower-left area or lower-center of the screen, press the F1 key. The ThinkPad Setup menu will be displayed. If a password prompt appears, type the correct password.
Select Restart, then make sure the operating system Optimized Defaults option is set to:
Enabled (for Windows 8 64-bit)
Disabled (for Windows 8 32-bit)
Press the F9 key to load default configuration.
Select Yes.
Insert the Windows 8 Installation DVD into the DVD drive, then press the F10 key to save configuration and exit.
Select Yes.
Follow the instructions on the screen to restart the computer.
Follow the instructions of Windows 8 installation DVD to install Windows 8.
How to install Microsoft Windows 7 on the Windows 8-based computer:
Turn on the computer to start Windows 8.
Hold down the Windows logo key and press C to open the Charm bar on the screen.
Select Settings, then Power from the menu.
Select Reboot to restart the computer.
While the “To interrupt normal startup, press Enter” message is displayed at the lower-left area or lower-center of the screen, press the F1 key. The ThinkPad Setup menu will be displayed. If a password prompt appears, type the correct password.
Select Restart, then make sure the operating system Optimized Defaults option is set to Disabled.
Press the F9 key to load default configuration.
Select Yes.
Insert the Windows 7 Installation DVD into the DVD drive, then press the F10 key to save configuration and exit.
Select Yes.
Follow the instructions on the screen to restart the computer.
Follow the instructions of Windows 7 installation DVD to install Windows 7.